On Wed, 2014-02-12 at 21:13 -0500, Patrick Palka wrote:
> When !defined(CONFIG_EXT4_DEBUG), mb_debug() should be defined as an
> empty do-while statement so as to suppress the following compiler
> warning:
Hello Patrick.
> fs/ext4/mballoc.c: In function ‘ext4_mb_cleanup_pa’:
> fs/ext4/mballoc.c:2659:47: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
> mb_debug(1, "mballoc: %u PAs left\n", count);
> ---
> diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
[]
> @@ -48,7 +48,7 @@ extern ushort ext4_mballoc_debug;
> } \
> } while (0)
> #else
> -#define mb_debug(n, fmt, a...)
> +#define mb_debug(n, fmt, a...) do { } while (0)
Ideally, this section should be something like below
so the !CONFIG_EXT4_DEBUG case still verifies that
the format and argument types match.
This can help avoid people adding debug statements but
not compiling with the proper CONFIG_<foo> variable set.
---
#ifdef CONFIG_EXT4_DEBUG
extern ushort ext4_mballoc_debug;
#define mb_debug(n, fmt, ...) \
do { \
if ((n) <= ext4_mballoc_debug) \
pr_debug(fmt, ##__VA_ARGS__); \
} \
} while (0)
#else
#define mb_debug(n, fmt, ...) \
no_printk(KERN_DEBUG fmt, ##__VA_ARGS__)
#endif
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